FEATURES

• The SRM-6A and SRM-6D, Asynchronous Short Range Modems, are used for local data distribution, connecting full duplex asynchronous DTEs to computers or controllers.
• A pair of modems will ensure integrity of data transmission, using unconditioned 4-wire twisted pair lines at data rates up to 19.2 kbps. SRM-6A and SRM-6D operate over distances up to 8 km (5 miles), depending on the wire gauge and data rate (see Table 1).
• SRM-6A and SRM-6D are available as standalone units or as rack-mount cards for mounting in the CMN-16 modem rack (see the CMN-16 folder for further information).
• SRM-6A is supplied with an isolating transformer. (SRM-6D is supplied without one.) This transformer, in conjunction with other circuitry, protects against AC or DC overvoltages. As the transformers are rated at over 1,500 VRMS, SRM-6A modems are suitable for connection to local circuits provided by most national telephone administrations (P.T.T.s).
• SRM-6AU is equipped with an internal filter (see Ordering). The internal filter of SRM-6AU is designed to overcome both radiated and conducted interference for high noise immunity, and is recommended for noisy environments such as industrial locations. SRM-6A is available without an internal filter.
• Innovative circuitry allows the modems to operate without connection to the mains supply, by using ultra-low power from the data and control signals.
• The low transmit level of 0 dBm minimizes cross-talk onto adjacent circuits within the same cable. Data is transmitted and received using a balanced interface. This ensures high immunity to circuit noise.
• The modems feature a switch-selectable DCE/DTE option. This permits them to operate as DTE for connection to another DCE (such as a multiplexer port), without the use of a cross-cable.

SPECIFICATIONS 

• Asynchronous, full duplex
• Data rates up to 19.2 kbps
• Transmission range (for 24 AWG):
  SRM-6A: up to 8 km (5.0 miles)
  SRM-6D: up to 8 km (5.0 miles)
• No AC power required
• Transformer isolated
  (SRM-6A and SRM-6AU only)
• DCE/DTE switch
• Plugs directly into V.24/RS-232 connector
• Compact, lightweight, easy to install
• Available as a standalone unit or as a card for mounting in a 19" modem rack
• Internal filter for high noise immunity and noise suppression
  (SRM-6AU only)

SRM-6A/*/+
Async Short Range Modem, transformer isolated

SRM-6AU/*/+
Async Short Range Modem, transformer isolated, with built-in noise filter

SRM-6D/*/+
Async Short Range Modem

ORDERING
 
SRM6A/F
SRM6A/F/01
SRM6A/F/01/RJ11
SRM6A/F/RJ11
SRM6A/F/RJ45
SRM6A/F/RJ45S
SRM6A/M
SRM6A/M/01/RJ11
SRM6A/M/RJ11
SRM6A/M/RJ45
SRM6A/M/RJ45S
 

SRM6AU/F
SRM6AU/F/RJ11
SRM6AU/F/RJ45S
SRM6AU/M
SRM6AU/M/RJ11
SRM6AU/M/RJ45S

APPLICATIONS